Heavy Crossbowman

Mercenary (Sacrifice this creature on your upkeep unless you sacrifice a treasure)
Heavy Crossbowman does not untap during your untap step.
Put a +1+1 counter on Heavy crossbowman on your upkeep.

Untap Heavy Crossbowman: Remove all +1+1 counters from Heavy Crossbowman; deal damage equal to the number of counters removed in this way to any target.